drm/rockchip: cdn-dp: add more log for video config

In order to analyze some video config failed, add some useful
printouts.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1488940077-22297-4-git-send-email-zyw@rock-chips.com

diff --git a/drivers/gpu/drm/rockchip/cdn-dp-reg.c b/drivers/gpu/drm/rockchip/cdn-dp-reg.c
index 963d8ab..b14d211 100644 (file)
--- a/drivers/gpu/drm/rockchip/cdn-dp-reg.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-reg.c
@@ -671,6 +671,10 @@ int cdn_dp_config_video(struct cdn_dp_device *dp)
                rem = do_div(symbol, 1000);
                if (tu_size_reg > 64) {
                        ret = -EINVAL;
+                       DRM_DEV_ERROR(dp->dev,
+                                     "tu error, clk:%d, lanes:%d, rate:%d\n",
+                                     mode->clock, dp->link.num_lanes,
+                                     link_rate);
                        goto err_config_video;
                }
        } while ((symbol <= 1) || (tu_size_reg - symbol < 4) ||